package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * @author xindezhentu
 * @create 2023-04-06 15:34 文件上传或者下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {


    @Value("${reggie.path}")
    private String basePath;

    @PostMapping ("/upload")
    public R<String> upload(MultipartFile file){
//        file是一个临时文件，需要转存到指定位置
        log.info(file.toString());

        String originalFilename = file.getOriginalFilename();

        String suffix=originalFilename.substring(originalFilename.lastIndexOf("."));

//        使用UUID
        String fileName = UUID.randomUUID().toString()+suffix;
//        创建一个目录对象
        File dir = new File(basePath);
//        判断当前目录是否存在
        if(!dir.exists()){
//            目录不存在，自己创建
            dir.mkdir();
        }
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
//        输入流，通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //        输出流，通过输出流将文件写回浏览器，在浏览器展示
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }



    }
}
